Mark Luetzelschwab wrote:
> 1. Step forward one frame in a player
Ah, this is a thorny one. QT is not frame-based; everything is done with
timecode integers. You can coerce an emulation of a frame-based system by
using the movie's timescale function.
These two functions may help get you started:
--
-- TimeCode2Time
--
function TimeCode2Time pTimeCode, pTimeScale
set the itemDelimiter to ":"
if the number of items of pTimeCode < 3 then
answer "Error: invalid time code format"
exit to MetaCard
end if
put item 1 of pTimeCode into tHours
put item 2 of pTimeCode into tMins
put item 3 of pTimeCode into tSecs
if item 4 of pTimeCode is not empty then -- support older frame-based
format:
set the numberformat to "00.000"
add (item 4 of pTimeCode / 30) to tSecs
end if
put (tSecs * pTimeScale) into tInt
add (tMins*60*pTimeScale) to tInt
add (tHours*3600*pTimeScale) to tInt
return round(tInt)
end TimeCode2Time
--
-- Time2TimeCode
--
function Time2TimeCode pInt, pTimeScale
if pInt = 0 then put 1 into pInt
if pTimeScale = 0 then put 1 into pTimeScale
put pInt / pTimeScale into tSecs
set the numberformat to "00"
put tSecs div 3600 &":" into tHrs
put tSecs mod 3600 into tSecs
put tSecs div 60 &":" into tMins
set the numberformat to 00.000
put tSecs mod 60 into tSecs
return tHrs & tMins &tSecs
end Time2TimeCode
One method might be to increment your own timecode, and use timecode2time to
get an integer value that you can set the player's currenttime property to.
Of course, the easiest way is to use the controller's Step buttons. :)
> 2. Tell if a movie has completely downloaded (after setting the
> fileName to a URL?). I think I can get around it by forcing the
> movie to play (these are very short clips) and waiting for a
> playStopped message at the duration...but there might be a better way
> to do this.
Check the UrlStatus function. Typically you would use "load...with
message", and then in the handler for that message use a timer to check its
status periodically.
See the urlDownload stack in mctools.com for a great implementation.
> 3. Save a movie in a player to a file.
Hmmm... that's an interesting one. Rather than use a URL in a player,
perhaps you could treat it as a data file and write it out as it comes in,
then assign it to a player when you're done. I'm sure there's a better way,
though, and with QT's "quick start" option it'd be a shame not to take
advantage of near-immediate playback while downloading.
Anyone else know a good method for this?
--
Richard Gaskin
Fourth World Media Corporation
Multimedia Design and Development for Mac, Windows, UNIX, and the Web
_____________________________________________________________________
[EMAIL PROTECTED] http://www.FourthWorld.com
Tel: 323-225-3717 AIM: FourthWorldInc Fax: 323-225-0716
Archives: http://www.mail-archive.com/[email protected]/
Info: http://www.xworlds.com/metacard/mailinglist.htm
Please send bug reports to <[EMAIL PROTECTED]>, not this list.
